Marvin, Murderous Mimic + Horseshoe Crab + Doc Samson, Super Psychiatrist

Marvin, Murderous Mimic

Horseshoe Crab

Doc Samson, Super Psychiatrist

How it works

1. Activate Marvin using Doc Samson's ability by tapping it, adding at least .
2. Activate Marvin using Horseshoe Crab's ability by paying , untapping it.
3. Repeat.

This clever loop transforms Marvin, Murderous Mimic into a one-robot engine by leveraging the activated abilities of both Horseshoe Crab and Doc Samson, Super Psychiatrist. While the Crab grants the crucial untap mechanism fueled by blue mana, Doc Samson provides the tap ability to generate the mana in the first place—and though his counter-doubling static ability isn't even needed to pull off the infinite loop here, the combined synergy lets Marvin endlessly tap and untap to churn out infinite colored mana.